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Phenom x4 motherboard/ram selection assistance 8x vs 16x pci-e?

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January 21, 2010 9:33:11 PM

Hello! I'm looking to build a new system soon. I've decided to go with;

Phenom X4 BE saving a few bucks from the 965) http://www.newegg.com/Product/Product.aspx?item=N82E168...

XFX HD-577X-ZNFC Radeon HD 5770 1GB http://www.newegg.com/Product/Product.aspx?item=N82E168...

I will probably xfire the 5770 later down the road and I'm not sure which MB to purchase. I'm looking for the 100ish price point (no more than 140) I was looking at boards with the AMD 790FX, AMD 790GX and AMD 790X North bridges... I haven't been able to find a quality FX MB in my price range, and I'm concerned with the downgrade to 8x pci-e if I crossfire with the GX or X ... I've read that the 8x vs 16x differences are less than 10% (which is acceptable) but all the places where I've read that are a few years old... any suggestions? In addition any memory suggestions, the timing stuff is all greek to me. Thanks for your help!
January 21, 2010 10:53:06 PM

Upendra09,
Thanks for the advice on the memory... I'll check through the memory pages for ddr3 with those timings...

Anyone have any current news on PCI-e 8x vs 16x? Still trying to decide on the 790FX(full 16x pci-e in crossfire) or 790X(8x when in Crossfire)... the only 790fx i could find in my range was the

Dfi Lan Boy
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

and I've never tried DFI... and heard iffy reviews on this specific board (runs hot among other complaints...) input appreciated!
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January 22, 2010 5:11:20 AM

Upendra09 said:
they make boards mainly for gaming and the aren't as popular

if you can stretch your budget this is also very good

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

this is for 150

the cheapest i could find



Thanks again for the input Upendra09... I was looking at that one too... what do you think of;

MSI 790FX-GD70
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
can accept DDR3 800/1066/1333/1600*/1800*/2133*(OC)

---- also thinking of these 790x boards (still wondering the performance difference)----

ASUS M4A79XTD EVO
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.msi.com/index.php?func=proddesc&maincat_no=1...

GIGABYTE GA-MA790XT-UD4P
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
http://www.gigabyte.us/Products/Motherboard/Products_Ov...

---- and finally heres what I came up with for memory (i think these are all identical, but I honestly don't know jack about memory)----

http://www.newegg.com/Product/Productcompare.aspx?Submi...

you tell me what to get out of those 4 boards, and 4 memory selections and this is as good as a closed topic! Thanks again!
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January 22, 2010 5:34:13 AM

and for those who stuble across this and might be wondering what the difference between the 790x and 790fx is...

790FX:
PCI-E 2.0 with up to 4 gpus
in 2x16,
or 1x16 + 2x8
or 4x8

790X:
PCI-E 2.0 with up to two cards
in 1x16
or 2x8

and the 790gx has on board video... I THINK its 2x 8x in xfire mode (NOT Positive)
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January 22, 2010 5:10:16 PM

Thanks for the article... I was looking for something to read like that!
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a b V Motherboard
January 22, 2010 9:08:25 PM

ok NO don't go for open box

open box= very bad

they are mostly refurbished motherboard that haven't be re certified for use and most of the time newegg won't take it back

in the 4 links you provided i would go with the Gigabyte
however, it might be more expensive

the difference between Crossfire at dual 8x and 16x is around 10 percent if i recall correctly
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January 23, 2010 9:08:15 AM

Upendra09 said:
ok NO don't go for open box

open box= very bad

they are mostly refurbished motherboard that haven't be re certified for use and most of the time newegg won't take it back

in the 4 links you provided i would go with the Gigabyte
however, it might be more expensive

the difference between Crossfire at dual 8x and 16x is around 10 percent if i recall correctly



hrmm I didnt know they were sticklers on the open box... definitely something to take into consideration... I'm leaning pretty heavily towards that Gigabyte, glad that was your recommendation... I figure 10% is something I can live with when I crossfire...

as for memory... I've never used g.skill or OCZ. Everyone seems to swear by them, whats the straight dope the way you see them?

I was leaning towards;
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

but the reviews are all over the spectrum and therefore worrisome... i figure its cheapest with decent timings, and I can burn it in for a day using memtest to make sure its not bunk... do you have any input on that or does that sound logical?
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Best solution

a b V Motherboard
January 26, 2010 12:21:58 AM

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

this is better, lower latency and less price

just OC this RAM and you will have a smooth setup
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January 26, 2010 6:19:34 AM

Best answer selected by retox9k.
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January 26, 2010 7:14:49 AM

Heres what I went with;

GIGABYTE GA-MA790XT-UD4P
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

XFX HD-577X-ZNFC Radeon HD 5770 1GB
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

CORSAIR CMPSU-650TX 650W
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

AMD Phenom II X4 955
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

OCZ Platinum 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1333
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

$650 out the door... I went with the Platinum instead of the gold due to a pricing bundle and I hope that the PSU is big enough to crossfire 2 mid range cards... Thanks again Upendra09!
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a b V Motherboard
January 26, 2010 8:32:17 PM

Very nice , Very nice

and no problem
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!